u/prite

Is 30 dollars enough? Depends. Many donors all contributing max 30? Great! One? Not so much.

Full Triad, actually.

It's not a promise for war. It's a promise for peace. Of course, irrationality among humans is as sure as the sun. Which is why it is extra important to set the right starting position.

If this starting position is lost — if nukes start flying, from any side — then of course words have no meaning left. Isn't that MAD?

And a policy of No First (nuke) Use.

One 1080p pixel stretched over four or more 4k pixels.

One Hulkenpodium, please.

Fair. Edited.

Is your music app ... Chromium?

You kids have it easy these days, with your wikeypedia and so on.

Back in my day, we called all of them leopards!

https://grbs.library.duke.edu/index.php/grbs/article/download/2231/5969

EDIT: https://en.wikipedia.org/wiki/Leopard#cite_note-6

Same word. Many Indic languages call it Rupia.

Unless it's a Boeing. Then you don't need to; it will open them for you.

Not your parent, but, only in place of 'cross that bridge' and only when it still makes sense.

TL;DR: yes.

Were it still a derogatory term ...

It is. A certain other community still uses this word as a derogatory term. They just don't say it out loud, lest they should be caught using this word by the public at large.

And i refuse to accept that only specific people can use a word.

Nigga please. The word ain't mine and the word ain't yours. The choice of its use, though, is still ours. Both 'if' and 'when'.

There's an Indian movie with a demon with that name. Local legends say he must not be summoned. It's a good horror film: Tumbbad

Israel and the US have carried out way more than that in Latin America.

Wait, what?

Scientists and journalists have been to the Titanic too. Some of them even in this uncertified sub. A lot of expeditions have been to the Titanic wreck.

TLS ECH can't come soon enough.

Fly the black flag, matey.

... than it's ever been.

Well, they don't have nukes again, yet. Civilization's Nuclear Gandhi would not have approved Ukraine giving up their Soviet nukes to Russia in exchange for a promise on non-aggression.

It would be present with any obstruction. Obstruction slows air, which slows air behind it, and so on until the skin of the train.

I suggest that you do the math, or a basic Cfd sim.

Been done plenty. Did you include skin-friction drag in your calculations/simulations?

The tunnel is a completely different situation ...

Partially; not completely. Sure, it's not 100% identical, but since I cited it as an example of the obstruction reaction theory, it doesn't have to be similar in every other aspect for it to be a valid example.

But even so it’s not a closed system.

Thermodynamics might require a closed system but aerodynamics doesn't.

There is no coupling.

I can show you a force-based coupling if you don't want to see the energy-based coupling. Would that be okay by you?

The air acts like a spring (use either velocity or pressure to represent spring force, they're interchangeable anyway). One end of the air is attached to the train body surface boundary layer. The other end is the obstruction. Train moves forward, spring gets compressed. Without obstruction, no compression.

Corollary 1: Two trains on two tracks. One is in open air and flat ground all around it, the other has a bunch of signboards just outside the tracks. The former experiences less aerodynamic drag than the latter.

Corollary 2: Two parallel tracks laid close by, two trains on them going opposite directions. When they meet and go by one another, each train experiences additional aerodynamic drag due to the delta-v. This drag decreases the farther apart the trains' body surfaces are.

They don't affect the train dude. And don't cause a drag.

They do. Aerodynamic drag on trains is a well-known, well-studied phenomenon. E.g., trains are known to require more traction power when going through tunnels than open air.

Trying to explain that via thermodynamics is a terrible way to study it though.

It stays in contact with replacement air that takes its place. Which stays in contact with air behind it. And so on all the way to the skin of the train. And skin surface area is a lot larger for trains than cross-section area.

Don't ignore skin-friction drag.